allow name change

src/components/UserNameForm.js

@@ -75,7 +75,7 @@ class EmailForm extends React.Component {
       <Form onSubmit={this.onSubmit}>
         <FormItem {...usernameProps.fromItem}>
           {getFieldDecorator('username', { ...usernameProps.decorator })(
-            <Input {...usernameProps.input} disabled/>,
+            <Input {...usernameProps.input} />,
           )}
           {
             <div class="alert alert-warning" role="alert">改名开启至10月9日23:59。改名后战绩将清空，并且需要点击切换用户按钮后才能进入游戏。</div>